scope:

This European Telecommunication Standard (ETS) gives guidance on international call routeing during the implementation of the Integrated Services Digital Network (ISDN) User Part version 2 of signalling system No. 7 (ISDN User Part (ISUP) version 2) in the European ISDN (see DE/SPS-6001 [3]).

This ETS is applicable to the functions required at ISDN international gateways and international transit exchanges for routeing and network planning in order to achieve practical international interconnection of networks.

The relevant CCITT routeing Recommendation is identified and clarifications and additions to this are provided, where necessary. In addition, CCITT Recommendations E.170 and E.171 need to be considered.

This ETS covers services offered during the implementation of ISDN, using ISUP version 2 in the international network. The list of services can be found in table 2 of this ETS.